Tera HOT Stainless Plain Lazy Self Stirring Mug Auto Mixing Tea Coffee Cup Office Home Gift Novelty Black Just press the button on the handle to do self mixing, easy and convenient. Mute mixing impeller and sealed mug cover, no need to worry about liquid splashing. High-quality stainless steel and food grade plastic made, safe and durable. Material: stainless steel/food grade plastic. Suitable for perfect for lazy tea, coffee lover both at home or in office.